Process and apparatus for sealing paper bags



March 3, 1936. J ROSMAlT 2,032,503

PROCESS AND APPARATUS FOR SEALING PAPER BAGS Filed May 2, 1932 3Sheets-sheaf; l

. INVENTOR. c/ofin A. Posmaz'b ATTORNEYS.

March '3, 1936. J A ROSMMT 2,032,503

PROCESS AND APPARATUS FOR SEALING PAPER BAGS Filed May 2, 1952 5Sheets-Sheet 2 llllllllllll l INVENTOR.

ATTORNEY-3.

March 3, 1936. J. A. ROSMAIT 2,032,503

PROCESS AND APPARATUS FOR SE ALING PAPER BAGS Filed May 2, 1932 5Sheets-Sheet 5 INVENTOR.

ATTORNEYS.

c/o/m A. Fosmai 1: y)

+ k NT LI l ua V v Patented Mar. 3, 1936 UNITED-STATES PATENT OFFICE,

rnocnss AND APPARATUS FOR SEALING rArnn BAGS I John Bosmait, Manistee,Mich. Application May 2, 1932, Serial No. 608,580

' '15 Claims. (01. 93-35) My invention relates to an improved processand apparatus designed, to function in connection with the manufactureof pasted bags to effect 'a permanent and secure closure of the pastedbottoms of the bags.

My improved process and apparatus cooperates with conventionalmanufacturing mechanism for forming pasted paper bags and is adapted toform a part of the continuous process of manufacturing such bags. It isparticularly advantageous in connection with the manufacture of multiplewall pasted bags where difliculty has always been experienced inefiecting a secure closure of the bag bottoms.

The invention relatesto the closing of one end of the bag forming tubeor tubes during the manufacturing operation and prior to the filling] ofthe bag rather than to the closure of a filled bag. An object of myinvention is'to so deliver pasted bags in a continuously moving streamthat they may be arranged in an' overlapping succession possessing ashingled effect which" successionmoves continuouslyforward and. issubjectedto pressure uponthe pasted bottoms of the bags as they movealong for such a length of time as isnecessary to cause the paste totake an initial set.

A further object is to bring this pressure to bear only upon-the pastedbottoms of the bags so that a uniform pressure will be maintained uponthose portions of the bag walls which are coated with adhesive and sothat .all the pressure brought to bear will be taken upon portions ofthe bag walls where the desired resulting eifect will be obtained.

Other objects and advantages will more fully appear from the followingspecification, appended claims and accompanying drawings, wherein:

Fig. 1 is a diagrammatic view of bag forming mechanism embodying myinvention.

Fig. 2 is a side elevation of mechanism embodying my invention.

Fig. 3 is a plan of the mechanism shown in 45 Fig. 2. 1

' Fig. 4 is a. perspective of a partially formed bag.

Fig. 5 is a perspective of a bag more completely formed than in Fig. 4but still incomplete.

Fig. 6 is a perspective of the bag, the bottom 60 of which has beeninterfolded: and pasted.

7 is an enlarged fragmentary view takenon the same line as Fig. 1.

In the manufactureof paper bags paper is delivered from a roll supportedfor unwinding 55 andinterfolded and secured together to form acontinuously advancing tube. 'This tube is cut off into desiredlengthsand ends of the successive lengths are interfolded and securedtogether to form the complete bag. This is a well known process. In themanufacture of paper bags hav- 5 ing a multiplicity of walls, rolls ofpaper are supported so that'the tubes formed therefrom are interleavedand. the, complete bag is formed of the several plies. These severalplies are inter- -folded at the ends to'form the bottom of the 10 therewas a tendency for the pasted bottoms of 20 the bags. to unfoldimmediately following the application of the paste theretoand the pastemay take initial set before the pressure is brought to bear upon thebags in the pile and while the bottoms are partially unfolded.

Applicant's process is designed to overcome this objection in thatapplicant intends to bring. pressure to bear upon the pasted bottoms ofthe bags immediately following the application of the adhesive thereto,and to maintain such pres- 30 sure for that-{period ofv time which willinsure the adhesive taking an initial set while the bottoms are heldtogether. In the severalfigures of the drawings: applicant shows -means,in the form' of a succession of rolls indicated generally as Ill, 35 fordelivering a folded pasted bag l2 to a traveling conveyor I 4 to passunderneath a second conveyor belt l6 and over a large roll l8 and asuccession of small rolls indicated as supporting the belts I4 and I6so' that the bag I! is dis- 40 charged as shown in Fig. 1 with thebottom 20 folded underneath the bag. In Figs. 4, 5 and 6 are shownvarious steps in the-folding of the bottom of the bag which' is securedtogether by adhesive. It is apparent that. any conventional neath theside wall of the bag.

My invention comprises apparatus adapted to cooperate with thismechanism for folding and pasting a bag and which receives the bags asthey are delivered in the substantially continuous stream from the bagforming machine. I pro-v vide a supporting structure of frame work 22.This supporting frame carries an endless chain conveyor 24 which travelsover sprockets 264 One of these sprockets is driven from a suitablesource of power 28 as shown in Fig.2. The other sprocket is providedwith an adjustment 30 to vary the tension on the chainwhich travels overthe sprockets. Supporting-guide rails32 are provided as shown in Figs. 2and 'I. This conveyor 'chain 24 is provided with a succession of closely'spaced rigid blocks 34 which extend crosswise of the chain and beardirectly on the guide rails 32.

superimposing the endless conveyor 24 is a second endless chainstructure 36. This chain travels over sprockets 38. One of thesesprockets is provided with an adjustment 4|]. The sprocket member 42 ismounted upon a lever 44 which .carries an adjustable counterweight 46and this sprocket member 42 rides upon the lowermost stretch of theupper chain to hold the same with considerable pressure against theuppermost stretch of the lower chain. The upper chain carries a closelyassociated series of weighted blocks 48 which may be formed of cast ironand which are arranged to superimpose the blocks 34 of the chainconveyor 24. A conveyor 50 is arranged to receive the bags dischargedfrom'the conveyor 24 to carry them to a suitable container or place ofstorage. In Figs. 1, 2 and 3 the bags are shown being subjected to theoperation de-:

scribed.

In addition to the chain conveyor and the endless chain pressuremechanism the supporting frame is provided with a second endless chainconveyor device-wherein the chain is indicated as 52 and the sprocketsas 54. A guide rail 56 is shown disposed ,between the chain '52 andthechain 24 and extending parallel thereto and adapted to form anadditio nal support to the bags. In the operation of the device thebags, with the bottoms pasted, are.de1ivered as shown from the mechanismindicated in Fig. 1 with the interfolded pasted bottoms folded overunderneaththe bag in a continuously advancing endwise moving stream onto the chain conveyor 24. The bags are deposited on to this chainconveyor so as to be advanced sideways by the conveyor. The pastedbottoms are disposed immediately over the conveyor blocks 34. The bagsare deposited on the conveyor as shown in Figs. 2, 3 and '1, namely, inan overlapping shingled relationship.

In Fig. '7 a succession of the bags with pasted bottoms are shown asthey lie upon the conveyor.

The same is true of Fig. 2 and this arrangement is more clearly broughtout in Fig. 3. The

weighted endless chain 36 superimposes the end- 5 less chain conveyor 24and the weighted blocks 48 rest directly upon the pasted bag bottoms.

The chain conveyor 24 rides over the guide rails those coated withadhesive.

the pressure exerting members are arranged on an excessively longconveyor upon which pressure is placed. It is apparent that the conveyorupon which pressure is brought to bear may travel at a far slower rateof speed than the conveyor which delivers the bags from the pastingmachine to the pressure conveyor for advancement there: 7

by. Due to the fact that the pressure is brought to bear only upon thepasted-bottoms of the bags,

there is no tendency upon the part of other portions of the bags to takesuch pressure to the disadvantage of the pasted bottoms. are arrangedmerely in piles and pressure distributed evenly thereover it may happenthat this pressure may be taken by portions other than In my arrangementopposite sides of the adhesively coated bottoms only and the remainderof the bag is free except that it is supported by the rail 50 and thecon-. veyor 52 so that the bag stream moves along at a uniform rate.

Due to the delivery of the bags with the pasted bottoms foldedunderneath the bags are stacked When bagsin a moving line with thebottoms-in alignment. I

A further advantage of'delivering the bags in what might be termed theshingle method of arrangement is that it is possible for the operator tograsp a large number of bags which are fed out in delivering much morereadily than when the I bags are delivered singly without'this method ofoverlapping.

As the bags are delivered continuously in an to take care of a largenumber'of bags in a relatively short time and such a method of deliveryoverlapping shingled arrangement it is possible accommodates itself tothe most expeditious bag I of bag movement delivers the bags to anoperator I in such a manner that the operator is readily able tocollectthe bags in stacks orpiles and'withdraw them to other places of deposit.The operv-' ator is therefore enabled by this process to take care ofthe production of the most rapid type of bagv forming mechanism.

Whatlclaimis: 1.. That step in the process of sealing the pasted bottomsof multiple wall paper bags which comprises advancing a' plurality ofsaid bags inqa substantially continuous line sidewise over a sup! portwith the several bags overlying each other in a shingled effect and withthe pasted bottoms of the several bags superimposing'each' other andwith the pasted bottom of each bag'folded underneath the bag andbringing pressure to bear upon the pasted bottom portions only of .thebags as they travel over the support.

' forming mechanism. Furthermore, this method- 2. That step in theprocess of sealing the interfolded pasted bottoms of paper bags whichcomprises, following the posting of the bottoms of the bags, deliveringa succession of said bags in a substantially continuous stream with thebags moving endwise and with the pasted bottom of each bag foldedunderneath the bag into a substantially continuous moving stream of bagsmoving sidewise and arranged in an overlapping shingled relationshipwith the pasted bottoms of the bags overlying each,oth er and with eachpasted bottom folded underneath its bag, and

bringing pressure to bear upon] the pasted bottoms of the bags as theyare advanced sidewise in such substantially continuously. movingstream.

'3. Apparatus for sealing the pasted-bottoms of 'paper bagscomprislngcontinuously advancing supporting means adapted to receive asuccession of paper bags for sidewise advancement thereby,

to v

and continuously advancing pressure means superimposing said supportingmeans to exert a pressure upon that portion of the bags which restsdirectly upon the supporting means, said pressure means comprising aplurality of weighted members freely adjustable during their advance toadapt themselves to the formation of the paper bags therebeneath.

4. Apparatus for sealing the pasted ends 0 paper bags comprising acontinuously advancing conveyor supported to withstand pressure fromabove while moving, bag/supporting means extending along parallel tosuch conveyor, means for delivering paper bags onto said conveyor forsidewise advancement thereby and continuously advancing pressure meanssuperimposing said conveyor to exert a pressure upon the ends of thebags which rest directly upon the conveyor.

5. Apparatus for sealing the pasted bottoms of a. plurality of paperbags comprising a continuously advancing bag supporting conveyorsupported to withstand pressure from above, bag

- supportingmeans extending along one side of said conveyor, means fordelivering paper bags in a substantially continuous succession to saidconveyor to lie crosswise thereover with the pasted bottoms of the bagsresting directly upon the conveyor, and a continuously advancingpressure imposing conveyor superimposing said bag supporting conveyor toexert a pressure on the pasted bottoms of the bags resting directly uponsaid bag supporting conveyor.

6. Apparatus for sealing the pasted bottoms of multiple wall paper bagscomprising a chain conveyor provided with a succession of rigid supportsextending crosswise thereof, supporting means over which said conveyortravels to take the weight and pressure imposed thereon, means fordelivering pasted paper bags to said conveyor bear upon the pastedbottoms of the bags resting .upon the chain conveyor, said blocks beingpivotally suspended from said chain mechanism as they bear upon the'bagsto adapt themselves to the formations assumed by the travelling bags.

'7. Apparatus for sealing the ,pasted bottoms of paper'bags comprisingan endless chain conveyor provided with a closely spaced apartsuccession of transversely arranged rigid bag supporting blocks,supporting means over which the uppermost stretch of said conveyortravels, means for delivering pasted paper bags in a substantiallycontinuously advancing stream to said endless conveyor to be carriedalong thereby with the pasted bottoms. of the bags resting directly uponsaid conveyor, a second endless chain structure superimposing saidchainconveyor and provided with a closely spaced succession of transverselyarranged rigidly weighted blocks pivotally suspended from the chainstructure and bearing directly upon the pasted bottoms of the bagscarried by said conveyor, and counterweight mechanism adapted to act oneach'block individually to press the same downward against deliveringpaper bags in asubstantially continuous succession to said conveyor tobe carried thereby, and a continuously advancing weighted vancing epressure from above and adapted to receive and carry a substantiallycontinuous succession of means superimposing said bag supportingconveyor to exert a pressure on the pasted edges.

ment, and means for tensioning said endless conveyors whereby thepressure exerted on the paper bags during their'advancement is varied.

10. Apparatus for sealing the pasted edges of paper bags comprising asupporting conveyor upon which paper bags are deposited to be advancedthereby, a weighted means superimposing said conveyor and adapted toadvance at a speed corresponding therewith, said advancing weightedmeans exerting a pressure on the pasted edges of paper bags throughouttheir advancement,

, and means for tensioning said weighted means whereby the pressureexerted on the paper bags by-said weighted means is varied. I

11. Apparatus for sealing the pasted,edges of paper bags comprising. asupporting conveyor upon which paper bags are deposited to be advancedthereby, a conveyor superimposing said supporting conveyor and carryinga plurality of weighted members adapted to bear downv upon the pastededges of the-paper bags throughout their advancement, and means forvarying the tension of said superimposing conveyor in order to vary theextent to which the weighted membersbear down upon the paper bags.

12. Apparatus for sealing the pasted edges of paper bags confprising asupporting conveyor upon which paper bags are deposited to be advancedthereby, a conveyor superimposing said supporting conveyor and carryinga plurality of self adjusting weighted members to bear down upon thepasted edges of the paper bags throughout their advancement, and apressure exerting means operable to act upon each weighted member alonefor a portion of its advancement to urge the same downward-to a greaterextent than its own weight is capable of doing, each of said weightedmembers adapted to adjust itself to'the irregularities of the paper bagstherebeneath as it bears down upon the same.

13. Apparatus for sealing the pasted bottoms of paper bags comprising acontinuously ad ess conveyor adapted to withstand paper bags arranged inshingled overlapping relationship crosswise thereof with the pastedbottoms in alignment, an endless pressure conveyor arranged in opposedsuperimposed alignment to' said supporting conveyor, said pressureconveyor provided with a plurality of weighted pressure elementsarranged in succession lengthwise thereof, and means adapted tosuccessively engage said elements urging each element in successiontoward the supporting conveyor.

14. That method of sealing the pasted, bottoms 4- I de s-2,503 w inalignment, bringing pressure to bear upon the pasted bottoms only of thebags and upon each bag individually during its advancement.

15. That method of sealing pasted bottoms of paper bags includingadvancing a. plurality of said bags sidewise upon a support incontinuously moving succession and arranged with pasted bottoms inshingled overlapping relationship, bringing a plurality of pressuremembers to bear on the pasted bottom of each bag and advancing saidpressure members in the same direction as the bags at substantially thesame rate of travel to seal said pasted bottoms together.

' JOHN A. ROSMAIT;

